eelblenny vs prickleback

eelblenny and prickleback both are nouns.

Word	Noun	Adjective	Verb	Adverb
eelblenny	Yes	No	No	No
prickleback	Yes	No	No	No

As nouns, prickleback is a hypernym of eelblenny; that is, prickleback is a word with a broader meaning than eelblenny:

eelblenny: eellike fishes found in subarctic coastal waters
prickleback: small elongate fishes of shallow northern seas; a long dorsal fin consists entirely of spines

eelblenny (noun)	prickleback (noun)
eellike fishes found in subarctic coastal waters	small elongate fishes of shallow northern seas; a long dorsal fin consists entirely of spines
	small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship; subjects of much research